/Engine/Source/Runtime/SlateCore/Public/Widgets/SBoxPanel.h
Handle this event to determine whether a drag and drop operation can be executed on top of the target row widget. Most commonly, this is used for previewing re-ordering and re-organization operations in lists or trees. e.g. A user is dragging one item into a different spot in the list or tree. This delegate will be called to figure out if we should give visual feedback on whether an item will successfully drop into the list.
WidgetArgsType & OnCanAcceptDrop &40; const FOnCanAcceptDrop & InDelegate &41;